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There were 2 68 front spoiler designs. The first design, used for most of '68 production, was smaller and fastened only to the lower body panel, no braces. The second design was larger and had additional braces for mounting.

I posted a related question on the restoration page but this is a good dialog here. The question is for early production spoliers ( mine was March 68) what type of fasteners were used? My ASM has no page for this option and I have none of the original fittings. I assume they were phillips screws with a captive washer or SEM indented hex with a captive washer size 10??

When i got my car the original spoiler was gone but what remained was pieces of the plastic under six regular 5/16 head self tapping screws. All the holes where the support braces would attach were untouched and still had paint in them so i knew i didnt have the second type larger spoiler and replaced it with the short textured one. My car was in storage for 15 years prior to me getting it and was mostly original & unmolested with 58xxx showing on the speedo so i would guess those self tappers were original but i suppose the original owner could have added the spoiler. Hope that helps and glad i found this place!!!

I think your spoiler screws may have been replaced at some time. Based on input from local owners with original cars it seems they could be #10 Philips head machine srcrews with a hex nut/captive washer on the backside.

Arno,Do you have any pics of what the screws you are referring to look like? Do you know if the originals had any type of markings and was this for the first type spoiler or second type spoiler?Thanks Chris.

I have 1969 camaro with the spoiler option, the original front spoiler screws are 1/4-14x 5/8 7/16 AF with. 75 OD flanged washer. If you go www.amkproducts.com, part# B-12101, they have this screw which is the same as the original except for the head markings, I don"t know if the 1968 used the same screw I would think it would be similar.

What is the dia of the captured washer on the # 9417075 screw and the dia of the captured washer on the # 3759924 nut, I found the nut in the AMK catalog with that part number, they list it as, 10-24 3/8 AF .45 od washer and .19 OAH, is this correct ?

Many spoilers have been broken/torn off over the years and replaced with non-standard fasteners, but the above are what they were originally built with.

Hi John,

Could you possibly post some images of these screws & fasteners? I'd like to see the markings andmounting particulars if possible. I believe you supplied me with an image of the screw for the center support to sub-frame a few months ago.